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Search for GUT Monopoles at Super-Kamiokande

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arxiv 1203.0940 v1 pith:OBZNOZIP submitted 2012-03-05 hep-ex astro-ph.HEastro-ph.SR

The Super-Kamiokande Collaboration: K. Ueno , K. Abe , Y. Hayato , T. Iida , K. Iyogi , J. Kameda , Y. Koshio , Y. Kozuma
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M. Miura S. Moriyama M. Nakahata S. Nakayama Y. Obayashi H. Sekiya M. Shiozawa Y.Suzuki A. Takeda Y. Takenaga K. Ueshima S. Yamada T. Yokozawa K. Martens J. Schuemann M. Vagins C. Ishihara H. Kaji T. Kajita K. Kaneyuki T. McLachlan K. Okumura Y. Shimizu N. Tanimoto E. Kearns M. Litos J. L. Raaf J. L. Stone L. R. Sulak K. Bays W. R. Kropp S. Mine C. Regis A.Renshaw M. B. Smy H. W. Sobel K. S. Ganezer J. Hill W. E. Keig J. S. Jang J. Y. Kim I. T. Lim J. B. Albert K. Scholberg C. W. Walter R. Wendell T. Wongjirad T. Ishizuka S. Tasaka J. G. Learned S. Matsuno T. Hasegawa T. Ishida T. Ishii T. Kobayashi T. Nakadaira K. Nakamura K. Nishikawa Y. Oyama K. Sakashita T. Sekiguchi T. Tsukamoto A. T. Suzuki Y. Takeuchi M. Ikeda A. Minamino T. Nakaya L. Labarga Ll. Marti Y. Fukuda Y. Itow G. Mitsuka T. Tanaka C. K. Jung G. Lopez I. Taylor C. Yanagisawa H. Ishino A. Kibayashi S. Mino T. Mori M. Sakuda H. Toyota Y. Kuno M. Yoshida S. B. Kim B. S. Yang H. Okazawa Y. Choi K. Nishijima M. Koshiba Y. Totsuka M. Yokoyama S. Chen Y. Heng Z. Yang H. Zhang D. Kielczewska P. Mijakowski K. Connolly M. Dziomba E. Thrane R. J. Wilkes
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classification hep-exastro-ph.HEastro-ph.SR
keywords betalimitmonopoleenergyfluxmagnitudemonopolesneutrino
verification ladder T0 review T1 audit T2 compute T3 formal
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GUT monopoles captured by the Sun's gravitation are expected to catalyze proton decays via the Callan-Rubakov process. In this scenario, protons, which initially decay into pions, will ultimately produce \nu_{e}, \nu_{\mu} and \bar{\nu}_{\mu}. After undergoing neutrino oscillation, all neutrino species appear when they arrive at the Earth, and can be detected by a 50,000 metric ton water Cherenkov detector, Super-Kamiokande (SK). A search for low energy neutrinos in the electron total energy range from 19 to 55 MeV was carried out with SK and gives a monopole flux limit of F_M(\sigma_0/1 mb) < 6.3 \times 10^{-24} (\beta_M/10^{-3})^2 cm^{-2} s^{-1} sr^{-1} at 90% C.L., where \beta_M is the monopole velocity in units of the speed of light and \sigma_0 is the catalysis cross section at \beta_M=1. The obtained limit is more than eight orders of magnitude more stringent than the current best cosmic-ray supermassive monopole flux limit, F_M < 1 \times 10^{-15} cm^{-2} s^{-1} sr^{-1} for \beta_M < 10^{-3} and also two orders of magnitude lower than the result of the Kamiokande experiment, which used a similar detection method.

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